Ocelot's gone into far more detail than I ever could, but here are my own:

Microsoft:

No doubt in my mind that they nailed the quantity of games and general showmanship, but the only games they showed I ever want to play were Cyberpunk and Just Cause 4. Hard meh due to my personal preferences.

Sony:

The whole thing had a bit of a vibe like being invited to that weird kid's house, but the games they had looked spectacular. Death Stranding, Spiderman, Ghosts of Tsushima are all games I am extremely excited to play.

Nintendo:

I was hoping Nintendo would announce the second generation of Switch, in the same style as the DS Lite or the New 3DS. I want to get one but I know there are flaws in the console that can be fixed.

I'm (very) excited for the new Pokémon, don't care at all about Smash, wish they would do something with their other IPs (I know you have a Metroid in development Nintendo, show us that).

Bethesda:

Well, I might get to play TES6 before I die. Starfield looks inscrutably teaser trailery, it could be an advert for washing powder for all the info we got.

Hooray, Bethesda are Metal-Gear-Survive-ing Fallout. Because what we've always wanted in Fallout is for LoneDabber877 is to come and teabag us in bright pink power armour. Sigh.

Ubisoft:

I just had to Google what they revealed, because all I could remember was AC Odyssey. Which looks great fun, but I'm still pretty burned out on the franchise so we'll have to see. Splinter Cell would have been nice, but I guess they're still working out how to make that open world with 695,000 minimap icons.

EA:

Bioware is making slightly better Destiny/worse Mass Effect in Anthem. Mass Effect "isn't dead", but they've chained it up in the basement and won't consider letting it out for a while.

Another Star Wars game that will be cancelled or have a stripped down single player so you can buy lootboxes.

I hate these guys.

Square Enix:

Shadow of the Tomb Raider looks fun, if silly levels of DARKNEEESS. Remember when going on an adventure used to be fun? Just Cause looks similarly enjoyable.

Konami

I think someone saw Konami drunk in the lobby, screaming about Pachinko, but they were escorted back to their room, throwing up terrible ideas as they went.

Edit: Best game of E3 for me is OVERCOOKED 2. The first game is pure joy, and this looks like more of that.

I love the single-player Bioware RPGs so much, the Mass Effect series is among my best ever gaming experiences (and I liked Andromeda, fight me).

This just looks like Destiny except a few rocket boosters thrown in, and they're freely admitting that the single player experience is second class.

There's no way you can make a story that really matters when the world has to sit in this perpetual status quo to accommodate for online. It's why, much as I love SWTOR, it felt laughable that throughout the Zakuul storyline nothing changed anywhere else in thr galaxy.

Ugh. I just feel that if people want to play a derivative, mediocre version of Destiny, then they can play Destiny. Give us an awesome rpg. Use the Star Wars license.